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【单选题】
电缆 直埋 敷设，施工简单，成本低，散热性能好。同一电缆沟内电缆一般不超过（ ） 根，埋设深度不小于 0.7m 。适用于人行道下，公园绿地及建筑物的边沿地带。A.
4
B.
6
C.
8
D.
10
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反馈参考答案：
举一反三
【单选题】关系模式中2NF是指( )
A.
满足1NF且不存在非主属性对码的传递依赖现象
B.
满足INF且不存在非主属性对码的部分依赖现象
C.
满足1NF且不存在非主属性
D.
满足1NF且不存在组合属性
【单选题】关系模式中2NF是指()。
A.
满足1NF且不存在非主属性对码的传递依赖
B.
满足1NF且不存在非主属性对码部分依赖
C.
满足1NF且不存在非主属性
D.
满足1NF且不存在组合属性
【单选题】The amount of lift can be increased by increasing the following parameters except .
A.
angle of attack
B.
critical angle of attack
C.
surface area of the airfoil
D.
velocity of the air
【单选题】a symmetrical airfoil is designed with an equal amount of above and below the chord line.
A.
pressure
B.
lift
C.
camber
D.
angle
【单选题】关系模式中2NF是指（ ）。
A.
满足1NF且不存在非主属性对关键字的传递依赖现象
B.
满足1NF且不存在非主属性对关键字部分依赖现象
C.
满足1NF且不存在非主属性
D.
满足1NF且不存在组合属性
【简答题】MP ( 前台 ) 通过以太网卡和后台相连 , 后台通过 HUB 将各个节点连接起来,前后台采用的协议是 。
【单选题】The designers of an airraft have set up the maximum weight, based on the amount of ____ the wings or rotors can provide under operation conditions for which the aircraft is designed.
A.
weight
B.
lift
C.
thrust
D.
drag
【单选题】词汇与结构 The maximum weight of an aircraft is based on the amount of ______ the wings can provide.
A.
drag
B.
lift
C.
weight
D.
thrust
【单选题】The ____ are plates fitted to upper surface of the wing and creating an increased amount of drag together with a decreased amount of lift.
A.
ailerons
B.
slats
C.
trim tabs
D.
spoilers
【单选题】is a common factor in airline accidents and a small amount of icing or coarse frost can greatly impair the ability of a wing to develop adequate lift.
A.
Windshear
B.
Icing
C.
Lightning
D.
Turbulence
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